采动与单轨吊共同作用下回采巷道非对称变形机理及控制研究

Mechanism and control of asymmetric deformation in mining roadway under combined action of mining and monorail crane

  • 摘要: 【目的】为解决王庄煤矿9106工作面回风巷顶板和两帮非对称大变形,且靠近实体煤帮侧的顶板变形更大的问题。【方法】分析其主要原因为采动与单轨吊共同作用导致,特别是单轨吊循环载荷导致靠近实体煤帮侧的破坏更为严重。数值模拟分析了9106回风巷单轨吊位置及其锚固深度对巷道变形的影响规律。【结果及结论】得知在单轨吊距实体煤帮2.5 m、锚固深度为13 m时,能够有效控制巷道变形。提出了9106回风巷“锚杆索+注浆”控制大变形方案,巷道最大变形量由1.5 m减至0.3 m以内,其有效控制了巷道非对称大变形。

     

    Abstract: This study addresses the asymmetric large deformation of the roof and two sides in the 9106 working face return airway of Wangzhuang Coal Mine, particularly the more severe roof deformation near the solid coal side.Through comprehensive analysis, it was determined that the primary cause is the combined effect of mining activities and monorail crane operations, with cyclic loads from the monorail crane exacerbating damage to the solid coal side.Numerical simulation was employed to investigate the influence of monorail crane positioning and anchoring depth on roadway deformation.The results indicate that positioning the monorail crane approximately 2.5 m from the solid coal side with an anchoring depth of 13 m can effectively suppress asymmetric deformation.A “bolt-cable+grouting” control strategy was developed and implemented, successfully reducing maximum roadway deformation from 1.5 m to below 0.3 m, and effectively controlling the asymmetric large deformation.

     

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